Franck Bui
d1d8786c5b
The new function DumpPatterns() can be used to limit (drastically) the size of the data returned by PID1. Hence the optimization of serializing data into a file descriptor should be less relevant than having the possibility to limit the data when communicating with the service manager remotely. NB: when passing patterns, the dump command omits the version of the manager as well as the features and the timestamps.
112 lines
3.3 KiB
C
112 lines
3.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include "build.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "hashmap.h"
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#include "manager-dump.h"
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#include "unit-serialize.h"
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void manager_dump_jobs(Manager *s, FILE *f, char **patterns, const char *prefix) {
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Job *j;
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assert(s);
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assert(f);
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HASHMAP_FOREACH(j, s->jobs) {
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if (!strv_fnmatch_or_empty(patterns, j->unit->id, FNM_NOESCAPE))
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continue;
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job_dump(j, f, prefix);
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}
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}
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void manager_dump_units(Manager *s, FILE *f, char **patterns, const char *prefix) {
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Unit *u;
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const char *t;
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assert(s);
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assert(f);
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HASHMAP_FOREACH_KEY(u, t, s->units) {
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if (u->id != t)
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continue;
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if (!strv_fnmatch_or_empty(patterns, u->id, FNM_NOESCAPE))
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continue;
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unit_dump(u, f, prefix);
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}
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}
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static void manager_dump_header(Manager *m, FILE *f, const char *prefix) {
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/* NB: this is a debug interface for developers. It's not supposed to be machine readable or be
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* stable between versions. We take the liberty to restructure it entirely between versions and
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* add/remove fields at will. */
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fprintf(f, "%sManager: systemd " STRINGIFY(PROJECT_VERSION) " (" GIT_VERSION ")\n", strempty(prefix));
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fprintf(f, "%sFeatures: %s\n", strempty(prefix), systemd_features);
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for (ManagerTimestamp q = 0; q < _MANAGER_TIMESTAMP_MAX; q++) {
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const dual_timestamp *t = m->timestamps + q;
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if (dual_timestamp_is_set(t))
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fprintf(f, "%sTimestamp %s: %s\n",
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strempty(prefix),
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manager_timestamp_to_string(q),
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timestamp_is_set(t->realtime) ? FORMAT_TIMESTAMP(t->realtime) :
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FORMAT_TIMESPAN(t->monotonic, 1));
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}
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}
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void manager_dump(Manager *m, FILE *f, char **patterns, const char *prefix) {
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assert(m);
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assert(f);
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/* If no pattern is provided, dump the full manager state including the manager version, features and
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* so on. Otherwise limit the dump to the units/jobs matching the specified patterns. */
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if (!patterns)
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manager_dump_header(m, f, prefix);
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manager_dump_units(m, f, patterns, prefix);
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manager_dump_jobs(m, f, patterns, prefix);
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}
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int manager_get_dump_string(Manager *m, char **patterns, char **ret) {
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_cleanup_free_ char *dump = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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size_t size;
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int r;
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assert(m);
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assert(ret);
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f = open_memstream_unlocked(&dump, &size);
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if (!f)
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return -errno;
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manager_dump(m, f, patterns, NULL);
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r = fflush_and_check(f);
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if (r < 0)
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return r;
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f = safe_fclose(f);
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*ret = TAKE_PTR(dump);
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return 0;
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}
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void manager_test_summary(Manager *m) {
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assert(m);
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printf("-> By units:\n");
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manager_dump_units(m, stdout, /* patterns= */ NULL, "\t");
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printf("-> By jobs:\n");
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manager_dump_jobs(m, stdout, /* patterns= */ NULL, "\t");
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}
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